Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 712 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 30 N. What is the size of the net force, in newtons?
2. 2.True or false: a nutcracker is a lever. (a) True (b) False
3. 3.⚖️ A lever bar balances. The load is 600 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
5. 5.True or false: a movable pulley rises with the load. (a) True (b) False
6. 6.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
7. 7.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the axle (c) the load (d) the effort
8. 8.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) gravity (d) magnetic force
9. 9.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
10. 10.💪 A box weighs 540 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
11. 11.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
14. 14.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
15. 15.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
17. 17.💪 In a tug of war, one team pulls right with 60 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
18. 18.True or false: your forearm is a class 2 lever (load in the middle). (a) False (b) True
19. 19.True or false: a movable pulley only changes direction. (a) False (b) True
20. 20.True or false: a wheelchair ramp is an inclined plane. (a) False (b) True
21. 21.Which of these is caused by gravity? (a) a fridge magnet sticks (b) a magnet picks up pins (c) an apple falls down (d) a compass needle turns
22. 22.⚖️ A seesaw balances. Zoya (200 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.True or false: pulling up your socks is a pull. (a) True (b) False
24. 24.⚖️ A lever bar balances. The load is 80 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.True or false: closing a drawer is a pull. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a truck loading ramp (b) a chisel (c) a road up a hill (d) a playground slide
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
29. 29.True or false: a movable pulley needs effort = load. (a) False (b) True
30. 30.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
31. 31.🪝 A load of 1160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.True or false: chalk on a gym bar gives more friction. (a) False (b) True
33. 33.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) muscular force (d) friction
34. 34.True or false: a tug of war is a pull. (a) True (b) False
35. 35.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
36. 36.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
37. 37.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a road up a hill (d) a wood screw

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